How do you connect multiple sites and offices with cloud-based communications?
Quick answer: instead of wiring every office to every other office (or back-hauling everything through one HQ data centre via leased lines/MPLS), a cloud-based connectivity model routes each site to the nearest point of presence on a shared backbone — Cloudflare's Magic WAN/Network Interconnect is one version of this — so sites, cloud VPCs, and remote workers all reach each other (and get the same security policy applied) without a physical mesh of private circuits.
The old model: hub-and-spoke over leased lines
Before cloud connectivity, connecting multiple offices meant MPLS or leased lines between sites, often routed through a central hub. This is expensive per circuit, slow to provision (weeks, sometimes months, for a new site), and creates a single point of failure at the hub — if the hub site's link degrades, every spoke site's inter-office traffic degrades with it. It also means security policy (firewalls, inspection) usually only sits at the hub, so site-to-site traffic that never transits the hub is unmonitored.
The cloud-based alternative
A cloud-connectivity provider runs a backbone of points of presence (PoPs) close to where your sites and users actually are. Each office gets a lightweight connection (an SD-WAN appliance, a GRE/IPsec tunnel, or a direct interconnect) into the nearest PoP rather than a dedicated circuit to every other site. Traffic between London and Singapore offices, for example, rides the provider's backbone between PoPs rather than a leased line you provisioned and pay for by the metre. New sites can be online in hours, not weeks, because there is no physical circuit to install — just a tunnel to the nearest PoP.
Why this pairs with Zero Trust
Once every site and every remote worker funnels through the same set of PoPs, that is also the natural enforcement point for identity-aware access policy — the same Zero Trust Access model covered in What is a VPN, and why should you care? applies consistently to an office worker on the LAN and a remote worker on their laptop, because both are evaluated at the same PoP rather than one being "trusted because it's the office network" and the other going through a separate VPN concentrator with different rules.
Practical takeaway
If your organisation is still pricing new-site connectivity in MPLS circuit lead times, or if office and remote-worker access run through two different security models, cloud-based multisite connectivity collapses both problems into one backbone and one policy set. That consolidation is also where seat/licence sprawl tends to hide — sites and cohorts of remote staff each provisioned separately, with no single view of who still actually needs a seat. Worth checking against the Zero Trust seat-audit waitlist if that overlap sounds familiar.